Texas Instruments TI-73 Manual Book page 43

6. Make a third copy directly below the base object by starting
at (3,2) and rotating 180°.
7. Make a fourth copy directly to the left of the base object by
starting at (2,3) and rotating 180°. You now have a pattern of
five diamonds forming a cross.
Consider how you might use reflection to create the same pattern.
Consider how you might use rotation to fill in the empty spaces
and form a large diamond.
TI-73 Geoboard Page 43